Pfizer pharmaceutical has sealed a deal with the manufacturers of Botox to create one of the biggest mergers in the Pharmaceutical industry.
The deal, which is still subject to regulatory approval, is the second largest ever pharmaceutical merger in history.
However, industry watchers have expressed concern that the merger will see Pfizer move its corporate headquarters to Dublin, where Allegran is based.
The move is seen as an effort to escape a huge tax bill in America.